Thermocouples and RTDs are the most common sensors used in process temperature measurements.
Simulating a process sensor signal into a process instrument or control system input enables a technician to verify whether the device responds correctly to the temperature measured by the instrument.
There are many different ways to simulate these sensors for testing purposes.
You can use a mV dc source and a mV vs temperature look up table for simulating thermocouples or a resistance decade box and resistance vs temperature look up table for simulating RTDs.
This method, however, has become outdated with modern temperature calibrators that do the conversion for the user.
With modern calibrators, simply select the sensor type to simulate, input the temperature to source and connect to the devices under test.
To perform the test:
To use a thermocouple simulator to test a device with a thermocouple input:
To use an RTD simulator to test a device with an RTD input:
Article source: Fluke
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Difference between grounding and ungrounding thermocouple ?
Grouded = fastest response.